Regulatory/Insurance issue?.
Last I heard a maint. approval from CASA is/was required in order to top fixed O2 bottles in an aircraft.
Has this changed?.
Filling O2 can be hazardous if done too quickly or with oily rags in close proximity etc.
Same kind of maint. approval was required when I used to have a Beech and changed single and dual controls.
Comments please from any LAMEs?.